Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d6427ef858339720ace88e4c9e4bbe19312c0acc758229d393b89dc4e723f8' 
  AND token = 'iyKQG5T1PpD60AvnairW69bpg357iy0t7yLZTDIhv0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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