Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6d6e2ff03291bac3cbbbfa44440a61baa5b1d87de05181448f1f0c48ce92ca' 
  AND token = 'w5flBWTBEo1vki/apOqfmmXmCsUawNnMsGyQSOGX4SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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