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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4b801a969f3452e9a6505d963e9091d8f9c4e55942c81ec39268c82b4ccbd36c' 
  AND token = 'gY+79k4WtnDBuIKSWEIMIUTwdWhUgVkzxRLTg3kMMgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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