Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac0109928bb5a240ed770012d67df684df80ae86aeee96fb6ced80e0b078286' 
  AND token = 'yw0svJELOHfGwUx+1CD4wuy6hy6qGdGYPTW1H/75Pgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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