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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4b458118022cf1f91c994a2b914f295a9ab4545e2e60c1d226cb31e63fadd879' 
  AND token = 'lk7lsIi8N/S8JiNsAQf2fVbd8GBsDL1a4yjUI41aRPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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