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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80a83e25ca167404a06ddf0189faea8bba7748caff1df512c367fa61d24fe43a' 
  AND token = 'De0ps7jPGX5HWKW3beBWjBLUd/+LbleTOC6Ly+sdvpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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