Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5d04e6b7fa59d6695a23e7b9fd63c52d202f68d7880cddde507c0f37dcc8be' 
  AND token = 'KZV8d1C8dLt8qLTHfkK2n3/j4/b6xcd/mBfMqIc2xN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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