Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a745c2f450ab9f42f59bed3e4b6bbfd4b41fac25134e998a19ccf4403bf17e3' 
  AND token = '+x8dzGEd0qY8vH1qhZfmaW0UXMNb/3+zQ4TekHkJ0HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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