Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5038ab19e560bb7fddce50c2f7f6c96ab46f13e0e452ad611dc51352c8f9ee32' 
  AND token = '+kOMUXhOVAJu6+t5FD/2cYtVHurAVng4J618lgBdy3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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