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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ac6139a68141179a048e80acc6c2833d8ab98b14b81afcba2b1c1c5f7bb1c267' 
  AND token = 'qjC3V7NlPpbnYY9VR+10ubOQPt/wPWye/bsdHd3I06s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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