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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ffd752190d88c1e71353ea1f8de4c9ceeb8227007ac7237ed19c18dc6d8f4a9' 
  AND token = 'btJVnN2F4dG8svfg+iGQuvwOLU5Oyg7laO6cFxSKxZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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