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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30c7a5ff784709b8cf70d1ba19329fe0a7a2988eae48036fa550d350b68a1538' 
  AND token = 'uLydUR1QJQB7oATlaqKy+eeT+ZhnKs9+h+nkR/8R4E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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