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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ba42f83110fba52a1983cf73312b122d704a5d5634d6ee587ccd2b310cf61e4' 
  AND token = 'vmdOcPIfKNm7JlqH7GqKfCPoB0mAwCN9dFg8UcuABMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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