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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '769613a7e4100a939ac22792fb303c3ad6d072322c24132fa1b7ccc0b6275c20' 
  AND token = '4XcN8Barnjk4sBCA7NolrgNLrEYBS/olISejk0KoOAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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