Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae51dc778c8519f4dcb3a6f2628fe0fbb8cbbacf9808f3cdf85cd4915a4621a' 
  AND token = 'uX5+PKdTybmLUliKvedrXfIf/3ilazKnE49SBZYP+FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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