Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb5d0c654cb360763a896ef3be07ee04fc03d13ea4381834c5885d588968f96' 
  AND token = '3fvgJWgSkLPCOEjq/nGgdk2tQPyc/JRltkQ+5KgvrK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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