Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7593ae9ae3082ee1a40fba27b6689431744a1907f44d072466cd4d0cbe5bcb0' 
  AND token = 'Z2lZOZ9XNRaC5PRP/d9tUrWBsrCEDJq8DsFfGJvInzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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