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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f26ce55edaab70dc06c6c13a564361aceb044982374f571c9d438a7f8b65b6f1' 
  AND token = '3rOtM7Tg81cQcjf0LoThZhfOth+C3NMbZFpvX0+femM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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