Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5573b0a0e10ffae78b1567e023270f6e3299e25833b023dafa260edbc8536c4' 
  AND token = 'GgHpH2ZqFLoAMVJV9rAnx6avWoFPxzHRO9sxeN28r6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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