Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05fd1e3aacfbf2250eb25170a0a01faa40dd562c9f07295c3a920d36c8562ef' 
  AND token = 'DKQxa4T8GEIQvpcxwI+Y9Pt9sR7Ix/A2uVV7coB/WUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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