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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '090d77f239b7237a2905fd50ae0b149a5705b5309247fa3c5c86c35d6b28b58a' 
  AND token = 'MGmcQ5lwiZH1Ry5S7oa7CjGph+OhXYrOtl5ZbXt2x5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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