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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4403f2512982bad2575c4bd922ffd8d86086593303f3ec6e37ddb2df4d2126c3' 
  AND token = 'wsqEvzLu4Rq64/WB/t0Sv3Id5Mx2PgJt37lI5XQnc/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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