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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '06bde56325250ec4281aad0c2739bf3196770ea4d5b8e085641286a6f440f40e' 
  AND token = 'IAsrhU8cqASqhtZcpWAedAq4i19dQWppkGPeHr0upDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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