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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2ea3fa989e1f4798905af1af68db6930cfd797bc9fb2a41b25e37920ed1d5880' 
  AND token = '1QLXCrKLgENj278bSLY5XV8qtEgM35Jordb7Ifr7j9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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