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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c223515da0f4057ad5dc57d38dde8349c7d59203f04f19fe589d44eded84d18f' 
  AND token = 'QFTKwdqfeQMT7Yhjue6+9A49mdnkQ9tCzVKdLl4/cKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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