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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '43bf80c7570120180d9a2e75f8acb759c4094b179324dad10567c9ac8027b85e' 
  AND token = '/VHjlo/OZtmQ0UDIXt6tQt5KeO6xFdA7fsMyeUbIp4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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