Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ce3e23e322654c7b6b4cf151343d8bb051df2d3a1e4fd3ac9bc695434e0d0b' 
  AND token = 'w/q8SQqjXadUdZCqJq1BYUSHXBdEqXcMdEI2BAOb7RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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