Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51d08585b126d17aa32548f39ca4a4fdfea3e5a632d0537e36c757b0c628ba4' 
  AND token = 'lOMparSlsEtP0vo/ecPQQhDvenuA25Kdyep8VrFu4T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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