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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f4d1e69e69e0816137ac76eb78342752480671812154858abc0c50c2f90b182a' 
  AND token = 'RhrqJGj0Bg1rLIthl+HFftcag+1w/kfrVQecARE2nL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}