SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '04bb5765c92b55fb030ae621326d8d4f86d7bf5d6b53d7483db6de951913c108' 
  AND token = 'VZILDi4vOU6jGVWtwGLnh4fD65y4Xnjjjye5lYwBCoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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