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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3831b7550c6aa789386ffe6b34203e5acdf394f9df843857d2bf8292d9904668' 
  AND token = 'ANhBHMbyM5KCaJgofu2ERBb8z+0aK/C3AbacqFC8IeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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