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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a67a6a52a217c5b0716d56ec5d2b23f20d650b40937748f4bfe02631f6c32385' 
  AND token = 'KcMu0pIOonGHY4VH7dRtfiEiddGsJNsHd8gO07EJc24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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