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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae42cabe10a324d0cb52f592b5a54c4b031557d040af3160539cf58920ce1f3f' 
  AND token = '7EfMeuG4dQjBFMjqpyLWmW0s5XuaEfMBT0hRp69n2Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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