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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb8430b1aa7092cef2eaa00b9b36c4f6bba3f440e83c44707271f47ed9f3525c' 
  AND token = 'YY9fMOYHPcaFOdefuEbhxjuSnpWOQAAGrPxDXZuOTx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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