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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b5f957ece01405bdc5f49d4c9d317eec5a591239ee390427ef480232c9d2f2a0' 
  AND token = 'n6Pzfje7GrpHEHpxrYYeQ55OLfDml9cnomKVfa8Lgrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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