Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8deca796badd9f6716f2151fe2beac1aa8ce150f9ee08992e685936eef3776' 
  AND token = '8qTR8cJyiFVhkkoYDmTzera4RlHCr0e3phZhb+sLADA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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