Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7426f3dc4b7ebd7e1f74330f0fe9e0eecf65be91786c2bb571f397d4b0c355' 
  AND token = 'HyWa1jbeISgjFMMT0ojToZTBXzyCdAcS9I+65pXaO90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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