Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a622206d1c3c4b0268e6f22c784a2c55fa4406119be0f741dd6c471023e018' 
  AND token = 'c9JODGdUY7MNbYpmOmSuiwxmLLOHT+V3HvpokxPbqfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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