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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '552769e6a4fbf7952f6f6f0db01bd0c3157ed131a666af43930331c51b885aea' 
  AND token = '09l4pmQru94scTlrM3whq0dRXlRrhqLVgZK4X2sbooI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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