Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db39b203bdb5ba5d0eef360d5729646da9fedfff0bca427647b0a40c6daff285' 
  AND token = 'kE92O/BMcFKNSlu2ENG76QYro2KZCJvs1R1YPrcRhvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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