Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e858e5de70951a9401101ab0a699574bfd2187d05bf3e540c6fd4543f1075da0' 
  AND token = 'Qmt13NY5MVIm8mOcFmR1btRuxVSpQkxttVEhdLwpOf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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