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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3ca5031f35a3680e201b7ffb96c97bf0837a5bf1ee9f2e6684059bab54db7ee8' 
  AND token = 'EWlH1TCQtXiwyr+0WfWoHxliTIb/L7uuWCPMY0z5k8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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