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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c3eee9f3e1f459cb7da72a2a161bac3283febf2bc927e801954502cf674552be' 
  AND token = 'zA6QqBbADbc+Xk6fK0aRkBwKAziEC5I1KX2gdJ9Nrl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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