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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e296c72ddf28c11ad9a192f43466ccb957c28a9ba67729f1d155791735c2a45a' 
  AND token = 'KCOFoY90IPsFSpwy9gOGwZ5upmskGRPyMCbw88+EucI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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