Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81154735a533ef63263a03b5c9c9b8c014cecb53ac4c6b528c08fea8e09b2c3' 
  AND token = 'C5r4u12gOFgQF2s5ycEPaSgDoaPK54062D3+f5ERP5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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