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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b29198e8b84611e88114faf2412121efca18c9a9f13065f42f22e16e6fd15c4' 
  AND token = 'UpxCdBUFHSAHIC+S5kJWkbjXwtsSeb65U+aC8O2RFkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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