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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7216bd07bb8504ce31cfbb8d03b9c9a6d1c9fbaff573ceccec2dacd7e04662d1' 
  AND token = 'qxSs0urkT6LhDRiO6PoL/U8vDNuc7VyNRXRk69yHxtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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