Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4454d764db46c6d9b1e83f4efd184eaff58803ac3b47eb94810406c6bf9e44a' 
  AND token = 'f6Evsb/AdDLu+1T4fMVSt3t5fPQkixRd1UQRG1muzIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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