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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '61020d598feec2f040c5bf4b9d978f6bd5561bb6eace26f77b0aadbb792d456f' 
  AND token = 'SR18KqtC1cKPSpFYvRinSzbIDckM1WP6FMt7OD8kEww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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