Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8909bc073df41ad1aaa4d00bdaba56d71147e1d5550d25c1ce6a88b688c38508' 
  AND token = 'BLrwOp3L0w10ZBqIOSyrQzGhXcj2Zkb1NlorU+4kyZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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