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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8813bb5f128f5e8cd3cd6efb1109ad493305b0bfdca12f83d362028bb1c73f96' 
  AND token = 'gX1qrYkitqq/t+39rCJ3lnscsn+OXYKtuxZDpOKorAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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