Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f869817f3a6cfae933b544ca8ca11605f3a1e6b9b9fc8bde20c2b3b1f0c4cb6b' 
  AND token = 'KmgsMFcNPiFTUBdQCpka0E7EvjKLxAdb6ofnq543HDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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