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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44581e0b67343ceb1de5444cebf6a1885d0f74bed0accfc703e929ae2749afcb' 
  AND token = 'VMUAnct9saM8LlYW3sI9XJZ+w/SgIKscisbY0ym0YHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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