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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f25a63d7e9648ce1aeeb5f00ea760f7605418cfb4f75ea4cc0d2a9806c192d49' 
  AND token = 'bfN/W5n2jMC4MXPwd9PIArDuOR7AqgzQZzedyQkiLgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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