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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'af0e3b0efbe6a285d00d682c6a43f1e1f5bb9e73c333b2ccc36027f60dc2c8f5' 
  AND token = 'eZHR/iJQSvysKyjh2FuqOigk2QGlm3Tbb6DF2kI7Yq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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