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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '020ab7f1b7fadee59cd8d4b9c5b842cc4b148ea380e4de0a722b7f02b81cfa84' 
  AND token = 'JuAniCH74VhI7FZig2TFUuUDiu8SOfUlFW5pFQ6jPds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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