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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a00d986874a16ad4950f4b7199c68dac0602b9e8d23388a832918e90602f4a76' 
  AND token = 'UdLPjNanhUUxxaxqQ5+NetC+tigQhiSMZa/fsmedTgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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