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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7b18cd27cc0b525425f341fd7b56700ba6c167f3e0a55e8e8359f74555be2adc' 
  AND token = '4WzbYfwHnF2c3zcA1gUR6gW8lR6Qls69aH/fxw+q79A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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