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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de7f3187cc7cb5a15bc9845292b64a11df0b1932f95db3ca3c9606b7e564cb95' 
  AND token = 'rkj8zQfoFS6NhqO4zj9TiXTV0w7heRk71IdWjn5jUHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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