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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8765c3d8ac9f27cc2d8e01011eea1a3a42f8dbf529f7f872d7dbabc415f52c30' 
  AND token = 'ZPRF59kNLhId6gxaxiYaFnp9dA2uLTe17bXrCdp3Acc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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