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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7f9ca7623f744658fb39912c28aed82e4e0647cf2f981d579528e32ee9b6d841' 
  AND token = 'ZBlkIdLBymVcHarmzXrG0Qc30xQqN7Pi2D4MoocSh8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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