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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b8de5bf90905c9c634a89e41660c8b8f78330f61b7734693b10f4104427e1717' 
  AND token = 'UEEleh7zsFwSKz7P6O+Nuu3Acw30MS9xHng4usnjYNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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