Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e70d53fbbd478382ac531af3a68b14bb36bd64b057d85772826c2e9384d77ae0' 
  AND token = 'D3y/YhHFOKBB5UacNoelCzG7X1jBt8DE2wXk0gkHO6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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