Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84d4084447edf4f353b11fa768e53cbc22d281a1f1c2c698d057cb80190f044' 
  AND token = 'g/ZyAmal17er4sgdaeEHxKoU3GAum1Tm1Rs3cl/0IU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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